Only balsa wood, cement, sanding paper, paint, fabric rope, iron wire and fine bamboo sticks from the garden-center, less than 20$. Really cheaper than the Verlinden 1/35 VC Sampan... Plus some accessories, as I like to make functional models, so I needed an outboard motor and a battery holder, not useful in a static display (my boat has also paddles). I started with a single hull side sketch, as you can see in the following pics, where you can find more explanation. Have a look here
http://www.warbird-photos.com/gpxd/view ... =1&t=37055 for the final result at sea.

It was relatively simple to make, so, if you want to go on with a sampan for your vietnam diorama... Remember that river sampan have a lower hull. Because all the planks are curved, you will have to sand the bottom of the hull sides to get a flat model, this has to be done of course before you cement the ground plank.